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Walking, hiking, crawling, or climbing through an ancient lava tube which is now free of lava flow, such as Ape Cave at Mount St. Helens. Probably involves the use of headlamps or flashlights.
Guy 1: "Hey man, what did you do this weekend?"
Guy 2: "Went lavatubing. It was awesome, I got cave bacteria all over my hands."
by anthroubc2010 October 01, 2010
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